The correct option is D all of the above
Telephonic communication takes place without visual clues. Hence, the person at the other side cannot see your body language and facial expressions. It is important to impress the listener as this form of communication leaves both parties in the blind and a positive conclusion can be arrived at only when the listner is impressed. Telephonic conversations achieve the purpose of interactive communication and both parties can put their pionts forward. Hence, all A, B and C are correct statements and thus, option D is correct.